Is this just a historical artifact? I know there used to be a UA LHR-BRU positioning flight.
Routing rules/fare info:
V FARE BASIS BK FARE TRAVEL-TICKET AP MINMAX RTG
1 SOWEU S X 31.00 ---- -/ -/12M EH01
PASSENGER TYPE-ADT AUTO PRICE-YES
FROM-LON TO-BRU CXR-UA TVL-05JUN13 RULE-9007 IPREURP/21
FARE BASIS-SOWEU NORMAL FARE DIS-N VENDOR-ATP
FARE TYPE-EU OW-ECONOMY UNRESTRICTED
GBP 20.00 0515 E17SEP09 D-INFINITY FC-SOWEU FN-
SYSTEM DATES - CREATED 16SEP09/1726 EXPIRES INFINITY
PUBLISHED RTG LON-BRU/UA515 /TAR-EURG EF-17SEP09 DIS-INDEF
/WITHIN THE EASTERN HEMISPHERE/
DOM ROUTE VALIDATION APPLIES WITHIN ORIG/DEST COUNTRIES
1. LON-UA-BRU